CN101963251B - Pilot-operated safety valve with modulation characteristic - Google Patents
Pilot-operated safety valve with modulation characteristic Download PDFInfo
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- CN101963251B CN101963251B CN2010102991585A CN201010299158A CN101963251B CN 101963251 B CN101963251 B CN 101963251B CN 2010102991585 A CN2010102991585 A CN 2010102991585A CN 201010299158 A CN201010299158 A CN 201010299158A CN 101963251 B CN101963251 B CN 101963251B
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Abstract
The invention provides a pilot-operated safety valve with modulation characteristic, which comprises a main valve and a modulation type guide valve, wherein a valve seat of the modulation type guide valve is fixed in the lower part of a cavity of a guide valve body; a guide valve piston is arranged above the cavity in the guide valve body and the valve seat of the guide valve; the middle upper part of a guide valve shaft is installed in the guide valve piston, and the lower part thereof is arranged in the valve seat of the guide valve; the connecting part between the upper part of the guide valve shaft and the guide valve piston is provided with an inlet sealing ring; and the connecting part between the lower part of the guide valve shaft and the valve seat of the guide valve is provided with an outlet sealing ring. The pilot-operated safety valve can be used for effectively controlling the pressure of an air chamber of the main valve, leads the pressure of the air chamber to be slowly reduced along with the augment of overpressure value, and ensures the opening height of the main valve to be gradually changed along with the overpressure value, thus guaranteeing the circulation area to be changed along with the demand of release quantity; and the discharge capacity can be adjusted according to the actual demand of the system for overpressure protection.
Description
Technical field
The present invention relates to a kind of Pilot operated safety valve that is used for the pressure system overpressure protection, be specifically related to a kind of Pilot operated safety valve with modulating characteristic.
Background technique
Pilot operated safety valve is a kind of non-direct-operated relief valve, is made up of a main valve and pilot valve, relies on pilot valve to discharge medium and drives or control the main valve unlatching.Common Pilot operated safety valve is the pop type Pilot operated safety valve on the market, and its main valve just can reach full open, and be swift in motion under very little superpressure situation.Because the opening and closing of pop type pilot valve are swift in motion, if be applied on the liquid medium, water attack takes place very easily, thereby this series products can only be used for gas and steam operating mode; The pop type pilot valve under the very little situation of superpressure, just can reach full open, so the medium amount of its actual discharge can be greater than the needed overpressure relief amount of system.
Because problems such as the pop type Pilot operated safety valve can not be used for incompressible medium, and discharge capacity is unadjustable, existing market is very urgent to the demand of modulation type pilot valve.
Summary of the invention
The object of the present invention is to provide a kind of Pilot operated safety valve with modulating characteristic; Its Lift that can realize main valve changes with the superpressure numerical values recited; According to system discharge capacity is regulated in the actual demand of overpressure protection, can be practiced thrift the medium and the energy effectively.
Realize the technological scheme of the object of the invention: a kind of Pilot operated safety valve with modulating characteristic, it comprises main valve; Described main valve comprises valve body of main valve, and the main valve valve seat is fixed on the valve body of main valve internal cavities, and the main valve flap is arranged on main valve valve seat top and is placed on main valve guide pin bushing inside, and the main valve cover plate is fixed on the valve body of main valve top; The cavity that main valve guide pin bushing, main valve cover plate and main valve flap form constitutes the main valve air chamber; The main valve inlet is arranged on the main valve bottom, and the main valve outlet is arranged on main valve one side; It also comprises the modulation type pilot valve that is connected with main valve; Described modulation type pilot valve comprises the pilot valve valve body, and pilot valve seat is fixed in the pilot valve valve cavity bottom; The pilot valve piston is arranged on pilot valve valve inner cavity, pilot valve seat top; The middle and upper part of pilot valve valve shaft is installed in the pilot valve piston, and the bottom of pilot valve valve shaft is installed in the pilot valve seat; Be provided with the inlet seal circle on pilot valve valve shaft top and pilot valve piston joint, be provided with the exit seal circle in pilot valve valve shaft bottom and pilot valve seat joint;
On the pilot valve valve body, have a path one, the cavity that this path holds connection to be formed by pilot valve piston and pilot valve valve shaft top one by one, the other end outlet port communicates with the main valve inlet through pressure tube three; On the pilot valve valve body, have a path two, these path 21 ends can be communicated with the cavity that is formed by pilot valve piston bottom, pilot valve valve shaft middle part and pilot valve valve body, and the other end outlet communicates with the main valve air chamber through pressure tube one; On the pilot valve valve body, also have a path three, these path 31 ends can be communicated with the cavity that is formed by pilot valve valve shaft bottom, pilot valve seat top and pilot valve valve body, and the other end outlet is through communicating with the main valve outlet through pressure tube two;
The pilot valve valve gap is fixed on pilot valve valve body top; Pilot valve spring and fixedly the pilot valve spring seat of pilot valve spring is arranged on pilot valve piston top, the pilot valve valve gap is inner, this pilot valve spring acts directly on the pilot valve piston; The pilot valve outlet pipe is connected pilot valve valve gap side; The pilot valve bonnet is fixed on pilot valve valve gap top; Pilot valve adjustment screw is arranged in pilot valve valve gap top, the pilot valve bonnet.
Aforesaid a kind of Pilot operated safety valve with modulating characteristic, its described pilot valve seat is installed in pilot valve valve inner cavity through being threaded.
Aforesaid a kind of Pilot operated safety valve with modulating characteristic, its described pilot valve valve gap is connected with the pilot valve valve body through bolt.
Aforesaid a kind of Pilot operated safety valve with modulating characteristic, its described pilot valve outlet pipe is installed in pilot valve valve gap side through being threaded.
Aforesaid a kind of Pilot operated safety valve with modulating characteristic, its described pilot valve adjustment screw is installed in pilot valve valve gap top through being threaded.
Aforesaid a kind of Pilot operated safety valve with modulating characteristic, its described pilot valve bonnet links to each other with the pilot valve valve gap through screw thread.
Effect of the present invention is: the Pilot operated safety valve with modulating characteristic of the present invention, can effectively control air chamber pressure, and air chamber pressure is slowly descended along with the increase of superpressure numerical value; Control through air chamber pressure; The Lift that makes main valve is graded with the superpressure numerical values recited, changes with the demand of the amount of releasing to guarantee circulation area, and discharge capacity can be regulated the actual demand of overpressure protection according to system; Practice thrift the medium and the energy, energy-conserving and environment-protective.Structure of the present invention can be used for incompressible medium, and modulating characteristic is good, can not produce water hammer.
In the pilot valve with modulating characteristic according to the invention, pilot valve particular structure form has played main effect.Two sealings are arranged in the pilot valve, the connection of inlet seal control main valve (pilot valve) inlet and main valve air chamber, exit seal control pilot valve export with the main valve air chamber between be communicated with.The movement travel of pilot valve piston and pilot valve valve shaft changes with the variation of inlet pressure; Inlet seal, exit seal alternately open and close; Control main valve air chamber pressure changes thereupon; The main valve flap is stressed also to be changed thereupon, realizes that ratio increases (minimizing) to the main valve Lift with the rising (reduction) of inlet pressure, shows modulating characteristic.
Description of drawings
Fig. 1 is the Pilot operated safety valve structural representation with modulating characteristic;
Fig. 2 is the Pilot operated safety valve pilot valve structural representation with modulating characteristic;
Fig. 3 is Fig. 2 partial enlarged drawing;
Fig. 4 is the Pilot operated safety valve opening state structural representation with modulating characteristic;
Fig. 5 is the Pilot operated safety valve pilot valve opening state schematic representation with modulating characteristic;
Fig. 6 is Fig. 5 partial enlarged drawing.
Among the figure: the 1-valve body of main valve; 2-main valve guide pin bushing; 3-main valve flap; 4-main valve valve seat; 5-main valve cover plate; 6-modulation type pilot valve; 7-pressure tube one; 8-pilot valve valve shaft; 9-exit seal circle; The 10-pilot valve seat; 11-inlet seal circle; 12-pilot valve adjustment screw; 13-pilot valve outlet pipe; 14-pilot valve spring seat; 15-pilot valve bonnet; 16-pilot valve valve gap; 17-pilot valve valve body; 18-pilot valve spring; 19-pilot valve piston; 20-main valve inlet; 21-main valve air chamber; The outlet of 22-main valve; 23-pressure tube two; 24-pressure tube three; 25-path one; 26-path two; 27-path three.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment the Pilot operated safety valve with modulating characteristic of the present invention is further described.
As shown in Figure 1, the Pilot operated safety valve with modulating characteristic of the present invention is made up of main valve and modulation type pilot valve 6, and the modulation type pilot valve enters the mouth 20 with main valve respectively through 3 pressure tubes 7,23 and 24, and main valve air chamber 21 and main valve outlet 22 link to each other.
As shown in Figure 1, main valve comprises valve body of main valve 1, main valve guide pin bushing 2, main valve flap 3, main valve valve seat 4 and main valve cover plate 5.Wherein, main valve valve seat 4 is installed in valve body of main valve 1 internal cavities, and main valve guide pin bushing 2 is installed in main valve valve seat 4 tops, and main valve flap 3 is installed in main valve guide pin bushing 2 inside, and main valve cover plate 5 links to each other with valve body of main valve 1 through bolt.The cavity that main valve guide pin bushing 2, main valve cover plate 5 and main valve flap 3 form constitutes main valve air chamber 21.Main valve inlet 20 is arranged on the main valve bottom, and main valve outlet 22 is arranged on the main valve left side.
As shown in Figures 2 and 3, modulation type pilot valve 6 comprises assemblies such as pilot valve valve body 17, pilot valve spring 18, pilot valve piston 19, pilot valve valve shaft 8, inlet seal circle 9, exit seal circle 11, pilot valve seat 10, pilot valve adjustment screw 12, pilot valve outlet pipe 13, pilot valve spring seat 14, pilot valve bonnet 15, pilot valve valve gap 16.Pilot valve seat 10 is installed in through being threaded in the pilot valve valve body 17 cavity bottoms.Pilot valve piston 19 is installed in pilot valve valve body 17 internal cavities, pilot valve seat 10 tops.The middle and upper part of pilot valve valve shaft 8 is installed in the pilot valve piston 19, and the bottom of pilot valve valve shaft 8 is installed in the pilot valve seat 10.Be provided with inlet seal circle 11 on pilot valve valve shaft 8 tops and pilot valve piston 19 joints, form inlet seal jointly by pilot valve piston 19, pilot valve valve shaft 8, inlet seal circle 11.Be provided with exit seal circle 9 in pilot valve valve shaft 8 bottoms and pilot valve seat 10 joints, form exit seal jointly with exit seal circle 9 by pilot valve seat 10, pilot valve valve shaft 8.
On pilot valve valve body 17, have a path 1, path one 25 one ends are communicated with the cavity that is formed by pilot valve piston 19 and pilot valve valve shaft 8 tops, and path one 25 the other end outlet ports communicate with main valve inlet 20 through pressure tube 3 24.
On pilot valve valve body 17, have a path 2 26, path 2 26 1 ends can be communicated with the cavity that is formed by pilot valve piston 19 bottoms, pilot valve valve shaft 8 middle parts and pilot valve valve body 17, and the outlet of path 2 26 the other ends communicates with main valve air chamber 21 through pressure tube 1.
On pilot valve valve body 17, also have a path 3 27, path 3 27 1 ends can be communicated with the cavity that is formed by pilot valve valve shaft 8 bottoms, pilot valve seat 10 tops and pilot valve valve body 17, and the outlet of path 3 27 the other ends is through communicating with main valve outlet 22 through pressure tube 2 23.
Like Fig. 1～shown in Figure 6, the Pilot operated safety valve with modulating characteristic of the present invention is when work:
Like Fig. 1～shown in Figure 3; When system pressure is lower than the Set pressure of valve; The pilot valve exit seal is closed, and is intercepted by exit seal and is not communicated with by pilot valve valve shaft 8 bottoms, pilot valve seat 10 tops and pilot valve valve body 17 cavity that forms and the cavity that is formed by pilot valve piston 19 bottoms, pilot valve valve shaft 8 middle parts and pilot valve valve body 17; Inlet seal is opened; The cavity that is formed by pilot valve piston 19 and pilot valve valve shaft 8 tops is connected through inlet seal with the cavity that is formed by pilot valve piston 19 bottoms, pilot valve valve shaft 8 middle parts and pilot valve valve body 17; System pressure gets into modulation type pilot valve 6 by the main valve inlet through pressure tube 3 24; Get into the main valve air chamber through pressure tube 1 again, act on the main valve flap 3, main valve is kept shut.
Like Fig. 4～shown in Figure 6; When system pressure is increased near Set pressure gradually; Pilot valve piston 19 moves upward; Make inlet seal close, intercepted by inlet seal and be not communicated with by pilot valve piston 19 and pilot valve valve shaft 8 tops cavity that forms and the cavity that forms by pilot valve piston 19 bottoms, pilot valve valve shaft 8 middle parts and pilot valve valve body 17; System pressure has increase more slightly; Pilot valve valve shaft 8 moves upward; Make the exit seal of pilot valve 6 open; The cavity that is formed by pilot valve valve shaft 8 bottoms, pilot valve seat 10 tops and pilot valve valve body 17 is communicated with through exit seal with the cavity that is formed by pilot valve piston 19 bottoms, pilot valve valve shaft 8 middle parts and pilot valve valve body 17, the release main valve outlet of the pressure portion of main valve air chamber, and pilot valve piston 19 is issued to the equilibrium of forces state at air chamber pressure and 18 actings in conjunction of pilot valve spring; Along with system pressure surpasses Set pressure gradually, pilot valve piston 19 and pilot valve valve shaft 8 move upward thereupon, and main valve air chamber 21 pressure constantly reduce, and the equilibrium of forces state is constantly revised, and makes main valve flap 3 move to accurate height, and keeps stable emissions status.When system pressure reaches discharge pressure, main valve flap 3 reaches the standard-sized sheet height, realizes the delivery discharging.
When system pressure begins to descend; Pilot valve valve shaft 8 moves downward; The pilot valve exit seal is closed, and is intercepted by exit seal and is not communicated with by pilot valve valve shaft 8 bottoms, pilot valve seat 10 tops and pilot valve valve body 17 cavity that forms and the cavity that is formed by pilot valve piston 19 bottoms, pilot valve valve shaft 8 middle parts and pilot valve valve body 17; Pilot valve piston 19 positions descend; Inlet seal is opened again; The cavity that is formed by pilot valve piston 19 and pilot valve valve shaft 8 tops is connected through inlet seal with the cavity that is formed by pilot valve piston 19 bottoms, pilot valve valve shaft 8 middle parts and pilot valve valve body 17; System pressure gets into main valve air chamber 21 again, and main valve begins to close.When system pressure was reduced to Reseating pressure of a safety valve, main valve returned seat.
By the way, the present invention has realized that ratio increases (minimizing) to the main valve Lift with the rising (reduction) of inlet pressure, shows modulating characteristic.
Modulation type Pilot operated safety valve of the present invention increases the acting characteristic that (reduction) approximate ratio formula is opened (closing) because of its Lift with inlet pressure, so water attack can not take place.It both can be used for the compressible medium operating mode, also can be used for incompressible medium.This modulation type pilot valve promptly according to the actual demand of system to overpressure protection, is regulated discharge capacity according to system pressure, so can practice thrift the medium and the energy effectively.
Claims (6)
1. Pilot operated safety valve with modulating characteristic, said Pilot operated safety valve comprises main valve; Described main valve comprises valve body of main valve (1), and main valve valve seat (4) is fixed on valve body of main valve (1) internal cavities, and main valve flap (3) is arranged on main valve valve seat (4) top and is placed on main valve guide pin bushing (2) inside, and main valve cover plate (5) is fixed on valve body of main valve (1) top; The cavity that main valve guide pin bushing (2), main valve cover plate (5) and main valve flap (3) form constitutes main valve air chamber (21); Main valve inlet (20) is arranged on the main valve bottom, and main valve outlet (22) is arranged on main valve one side; It is characterized in that: it also comprises the modulation type pilot valve (6) that is connected with main valve;
Described modulation type pilot valve (6) comprises pilot valve valve body (17), and pilot valve seat (10) is fixed in pilot valve valve body (17) the cavity bottom; Pilot valve piston (19) is arranged on pilot valve valve body (17) internal cavities, pilot valve seat (10) top; The middle and upper part of pilot valve valve shaft (8) is installed in the pilot valve piston (19), and the bottom of pilot valve valve shaft (8) is installed in the pilot valve seat (10); Be provided with inlet seal circle (11) on pilot valve valve shaft (8) top and pilot valve piston (19) joint, be provided with exit seal circle (9) in pilot valve valve shaft (8) bottom and pilot valve seat (10) joint;
On pilot valve valve body (17), have a path one (25), this path one (25) one end is communicated with the cavity that is formed by pilot valve piston (19) and pilot valve valve shaft (8) top, and the other end outlet port communicates with main valve inlet (20) through pressure tube three (24); On pilot valve valve body (17), have a path two (26); These path two (26) one ends are communicated with the cavity that is formed by pilot valve piston (19) bottom, pilot valve valve shaft (8) middle part and pilot valve valve body (17), and the other end outlet communicates with main valve air chamber (21) through pressure tube one (7); On pilot valve valve body (17), also have a path three (27); These path three (27) one ends are communicated with the cavity that is formed by pilot valve valve shaft (8) bottom, pilot valve seat (10) top and pilot valve valve body (17), and the other end outlet communicates with main valve outlet (22) through pressure tube two (23);
Pilot valve valve gap (16) is fixed on pilot valve valve body (17) top; Pilot valve spring (18) and fixedly the pilot valve spring seat (14) of pilot valve spring (18) be arranged on pilot valve piston (19) top, pilot valve valve gap (16) inside, this pilot valve spring (18) acts directly on the pilot valve piston (19); Pilot valve outlet pipe (13) is connected pilot valve valve gap (16) side; Pilot valve bonnet (15) is fixed on pilot valve valve gap (16) top; Pilot valve adjustment screw (12) is arranged in pilot valve valve gap (16) top, the pilot valve bonnet (15).
2. a kind of Pilot operated safety valve with modulating characteristic according to claim 1 is characterized in that: described pilot valve seat (10) is installed in pilot valve valve body (17) internal cavities through being threaded.
3. a kind of Pilot operated safety valve with modulating characteristic according to claim 1 is characterized in that: described pilot valve valve gap (16) is connected with pilot valve valve body (17) through bolt.
4. a kind of Pilot operated safety valve with modulating characteristic according to claim 1 is characterized in that: described pilot valve outlet pipe (13) is installed in pilot valve valve gap (16) side through being threaded.
5. a kind of Pilot operated safety valve with modulating characteristic according to claim 1 is characterized in that: described pilot valve adjustment screw (12) is installed in pilot valve valve gap (16) top through being threaded.
6. a kind of Pilot operated safety valve with modulating characteristic according to claim 1 is characterized in that: described pilot valve bonnet (15) links to each other with pilot valve valve gap (16) through screw thread.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102991585A CN101963251B (en) | 2010-09-30 | 2010-09-30 | Pilot-operated safety valve with modulation characteristic |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102991585A CN101963251B (en) | 2010-09-30 | 2010-09-30 | Pilot-operated safety valve with modulation characteristic |
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| Publication Number | Publication Date |
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| CN101963251A CN101963251A (en) | 2011-02-02 |
| CN101963251B true CN101963251B (en) | 2012-07-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2010102991585A Active CN101963251B (en) | 2010-09-30 | 2010-09-30 | Pilot-operated safety valve with modulation characteristic |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108343775B (en) * | 2014-12-08 | 2019-07-16 | 新沂经济开发区建设发展有限公司 | Power station main steam system top steam discharge electromagnetic relief valve |
| CN106499851B (en) * | 2015-08-20 | 2019-02-01 | 北京航天石化技术装备工程有限公司 | A kind of all-metal sealing pilot operated safety valve |
| CN106402444B (en) * | 2016-10-18 | 2019-01-11 | 中国核动力研究设计院 | A kind of pilot operated safety valve system |
| CN110230717A (en) * | 2019-07-12 | 2019-09-13 | 乐山市前沿油气设备制造有限公司 | Pilot operated safety valve |
| US11550344B2 (en) * | 2019-07-24 | 2023-01-10 | Emerson Automation Solutions Final Control US LP | Quick dome loading pilot valve |
| CN111734860B (en) * | 2020-08-10 | 2022-03-18 | 罗浮阀门集团有限公司 | Pilot operated safety valve with isolation air chamber |
| CN113202969B (en) * | 2021-04-16 | 2022-09-30 | 中国长江三峡集团有限公司 | Pneumatic pipe burst safety valve and method |
| CN113236802B (en) * | 2021-06-02 | 2023-03-10 | 中国长江三峡集团有限公司 | Pilot type differential pressure pipe burst safety valve and method |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4870989A (en) * | 1988-06-20 | 1989-10-03 | Keystone International, Inc. | High temperature safety relief system |
| CN2400659Y (en) * | 1999-10-14 | 2000-10-11 | 赵军 | Adjustable leading safety valve |
| CN2872014Y (en) * | 2006-02-20 | 2007-02-21 | 北京航天石化技术装备工程公司 | Guiding non-flowing pop safety valve |
| CN101482190B (en) * | 2008-11-27 | 2010-08-11 | 北京航天石化技术装备工程公司 | Controlled security pressure relieving apparatus with pneumatic assisting apparatus |
| CN201818858U (en) * | 2010-09-30 | 2011-05-04 | 北京航天动力研究所 | Pilot operated safety valve with modulating characteristic |
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2010
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Address after: 100076 Beijing, Fengtai District, South Road, No. 1, Patentee after: Beijing Inst. of Aerospace Dynamics Patentee after: Beijing Aerospace Petrochemical Technology and Equipment Engineering Corporation Address before: 100076 Beijing, Fengtai District, South Road, No. 1, Patentee before: Beijing Inst. of Aerospace Dynamics Patentee before: Beijing Aerospace Petrochemical Technology and Equipment Engineering Corp. |